Pianoforte



April 27 1926. 1,582,030

H. FocK ET AL PANOFORTE Filed April 19, .1.923

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Patented Apr. 27, 1926.

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Hnnnr roerrn, or Vrana-Moneta, Ann rnnnnzarc MARIN, or PANTIN, rennen.

PIANOFORTE.

Application led April 19, 1923. -Selal No. 633,258.

To all whom may concern.:

Be it known that we, HENRI Foonii, a citizen ot the French Republic,residing at 35 rrvenue Gallieni, Villemonble, Seine, France, andFi-:ninio Mmm, a citizen of the French Republic, residing at 2 Cite desFoyers, Pantin, Seine, France, have invented new and useful Improvementsin Pianofortes, ot which the following is the specification.

rlhis invention has for its objects an improvement in the manufacture ofpianos.

The piano forming the subject matter of the invention comprises, asother known pianos, a cast iron trame behind which the sounding-board,provided with a wooden framing ot small cross section, is secured forinstance by means of screws passing through the said framing andscrewing into the cast iron fra-me.

In the known pianos of this type, the pressure ot the springs on thebridges has the eifiect ot producing between the cast iron trame and thesounding-board a cert-ain` play or clearance, as the screws and thelight wooden frame cannot withstand the distortion of thesounding-board. When the wooden frame is ot large cross section this isavoided, but the width of the piano is increased. Besides, whatever maybe the cross section of the wooden trame, the shrinkage ot the woodowing to drying, produces some play in the assemblage.

The improvement forming the subject mattei' oi' the invention is adaptedto produce a piano oit' the above mentioned type, iu which the woodenframe, is of small dimensions but in which, however, the above stateddetects are overcome.

The invention consists in the arrangement of an intermediate woodenmember having an L-shaped cross-section, secured on the edge ot' thewooden trame of the soundingboard, and the iront ledge oi' which iitsover the ledge of the cast iron frame, this intermediate member beingsecured .by screws on the castiron trame and on the wooden trame and theside of the pianoforte being glued on this intermediate member.

T he accompanying drawings illustrate, by v. ay of example, one form otvcarrying out this invention.

Fig. l is a rear elevation of a device in accordance with thisinvention.

Fig. 2 is a front elevation ot the same.

Fig. 3 is a sectional plan view.

Fig. el is a plan View on an enlarged scale., parts being shown insection. l A

l designates the side of the body of the pianoforte, 2 thesounding-board, 8 the wooden framing ot' this sounding-board and l thecast-iron trame having a forwardly eX- tending ledge and on which thesoundingboard is removably secured by screws l0.

A wooden member 5 having an L-shaped cross-section is secured on theframing 3 and on the plate l by screws 8 and 9.

This member is provided at its front part with a ledge ll whichbearsagainst the front ledge of the plate i thus forming an abutment whichsecurely andr invariably holds the cast-iron frame against thesounding-board 2.

Consequently, the pressure of the springs, which has a tendency todistort the sounding-board in the direction of the arrow l2, cannotproduce any play between the trame e and the table 2.

It is moreover to be noted that the assemblage thus effected tends tocontract in proportion to the shrinkage of the wooden member 5, as thiscontraction is always greater than that of the member 3, the member 5being wider.

The side l of the body'is glued on the member 5 and, for greatersecurity, connected to the latter by screws 6 and 7 which respectivelypass through the framing 3 and the ledge of the cast-iron frame 4.

The assemblage thus carried out forms a very homogeneous whole andindefinitely preserves an absolute rigidity.

What we do claim as our invention and desire to secure by Letters Patentis:

l. In a piano, a sounding-board, a wooden trame placed on one side ofthe soundingboard, a cast-iron frame having a ledge and placed on theother side of the soundingboard, screws passing through the `woodenframe and the sounding-board and screwing in the cast-iron frame, awooden member having an L-shaped cross-section, an inner tace of whichcovers the joints of the wooden frame, sounding-board and castiron frameand the other inner face of which covers the ledge of the east-ironframe, means connecting the wooden member having an L-shapedcross-section to the wooden trame and cast-iron trame, and means forsecuring a side ot' the piano to the wooden member having an L-shapedcross-section.

2. In e piano, a sounding-board, e Wooden frame placed on one side ofthe Soundingbouid, a cus-iion frame having e ledge and placed on Jtheothei1 side of the soundingbofud, Screws passing' through the Woodenframe and the Sounding-board, and screw ing in the Ges-iron fiume, eWooden member having an L-shaped cioss-seeion an inner face of whichcoveis the joints oi the Wooden frame, soundingbozud :md oestiion frame.and the oher inner face of which covers the ledge oi the @esst-ironframea Screws passig through 'the Wooden memhei` having sm i.-Shupe iCross-section and screwing in Jshe Wooden frame, serews passing hioughthe Wooden member having an L- sheped cross-section and sei'ewiiig in'the cast-iron, "frame, Sciews passing Jhrough the Wooden frame andsereuiug in the member of L-Shaped eioss-Seeti 21 and in a Side of Jehepiene, and screws passing through 'the eastiron frame md serewmw in themember of L-shaped Cross-section and in the seid side of the pianofoie.

In testimony whereof We have signed oui1 names to this specification. f

HENR E. FREDERC MARIN.

